content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.Iterator;
  
  final class IxZipArray<T, R> extends Ix<R> {
  
      final Iterable<? extends T>[] sources;
  
      final IxFunction<? super Object[], R> zipper;
  
      IxZipArray(Iterable<? extends T>[] sources, IxFunction<? super Object[], R> zipper) {
          this.sources = sources;
          this.zipper = zipper;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public Iterator<R> iterator() {
  
          Iterable<? extends T>[] src = sources;
  
          Iterator<T>[] iterators = new Iterator[src.length];
          for (int i = 0; i < iterators.length; i++) {
              iterators[i] = (Iterator<T>)src[i].iterator();
          }
  
          return new ZipArrayIterator<T, R>(iterators, zipper);
      }
  
      static final class ZipArrayIterator<T, R> extends IxBaseIterator<R> {
  
          final Iterator<T>[] sources;
  
          final IxFunction<? super Object[], R> zipper;
  
          ZipArrayIterator(Iterator<T>[] sources, IxFunction<? super Object[], R> zipper) {
              this.sources = sources;
              this.zipper = zipper;
          }
  
          @SuppressWarnings("unchecked")
          @Override
          protected boolean moveNext() {
              Iterator<T>[] iterators = sources;
              int n = iterators.length;
              T[] a = (T[])new Object[n];
  
              for (int i = 0; i < n; i++) {
                  Iterator<T> it = iterators[i];
                  if (it.hasNext()) {
                      a[i] = it.next();
                  } else {
                      done = true;
                      return false;
                  }
              }
  
              value = zipper.apply(a);
              hasValue = true;
  
              return true;
          }
  
      }
  
  }
  